Hi Paul,
Thanks for your comments. The double PCB is standard in Fritzing (in what I started out with) so I went with that for now. However since Fritzing is giving me some small issues i'm thinking about switching to the free version of Eagle and use something like Seeedstudio for the PCBs (as it will give me a few PCBs for the same price, so if I mess up one with soldering).
I checked the IC datasheet to make sure but they dont put the requirements out there, it is a simple eeprom. However I'm thinking if I shouldnt add a 10 and 100 nF cap to the incoming power supply to the board just to make it nice
I'm still thinking if I should make a shield (clip on) or just a seperate PCB with a few wire jumpers. That will allow me to mount the RJ connector nicely in a case.
Thanks.
Martin